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Version 17
Safe-E-
Stop™
User Guide
8.2.3 Dual-Channel Connections Example when not using the COMM LOSS Relays
The following configuration provides the systematic capability of 3 provided by the E-Stop relays in a dual channel
configuration.
Where a strong process is in place that ensures the users confirm that the PSD is LINKED before starting to work,
the use of the COMM LOSS relays may not be needed.
The Ethernet bus may be used to give visual feedback of PSD status or total number of PSDs linked, or to allow
the green button to light a lamp, etc. This makes it possible to run the machine with the hard-wired E-Stop switch
in use and no PSD in use.
The dual-channel connection method below ensures a high level of reliability and monitoring is imposed; no
single-channel wiring fault will be possible.
The COMM LOSS reset function is not shown but is still required, see Fig 12.
Figure 14: MSD Typical Dual Channel Connections When Not Using the COMM LOSS Relays